/Engine/Plugins/FX/Niagara/Source/NiagaraEditor/Public/NiagaraValidationRules.h
This validation rule can marks this effect type as invalid and so must be changed. Forces a choice of correct Effect Type for an System rather than. Leaving as the default.
[UCLASS](Programming/UnrealArchitecture/Reference/Classes#classdeclaration)(Category="Validation", DisplayName="Invalid Effect Type") class UNiagaraValidationRule_InvalidEffectType : public [UNiagaraValidationRule](API\Plugins\Niagara\UNiagaraValidationRule)